Installing TXV in Place of Piston

1.Pump system down to 2 psig and recover refrigerant.

2.Remove hex nut from piston body. Use backup wrench on fan coils.

3.Remove and discard factory-installed piston. Be sure teflon seal is in place.

4.Reinstall hex nut. Finger tighten nut plus 1/2 turn.

NOTE: If the piston is not removed from the body, TXV will not function properly.

CAUTION: To prevent damage to the unit, use a brazing shield and wrap TXV with wet cloth or use heat sink material.

5.Install TXV on indoor coil liquid line. Sweat swivel adapter to inlet of indoor coil and attach to TXV outlet. Use backup wrench to avoid damage to tubing or valve. Sweat inlet of TXV, marked “IN” to liquid line. Avoid excessive heat which could damage valve.

6.Install vapor elbow with equalizer adapter to suction tube of line set and suction connection to indoor coil. Adapter has a 1/4-in. male connector for attaching equalizer tube.

7.Connect equalizer tube of TXV to 1/4-in. equalizer fitting on vapor line adapter.

8.Attach TXV bulb to horizontal section of suction line using clamps provided. Insulate bulb with field-supplied insula- tion tape. See Fig. 5 for correct positioning of sensing bulb.

9.Proceed with remainder of unit installation.

PISTON

RETAINER

PISTON

RING

PISTON

BODY

FIELD

CONNECTION

STRAINER

FLARE

ADAPTER

LIQUID LINE STRAINER

APPROX 2” LONG

STRAINER LABEL

(AFFIX TO LIQ. LINE

NEAR STRAINER LOCATION

A01019

Fig. 4—Check-Flo-Rater® Components

(550A, 552A Only)

REPLACING TXV ON R-22 INDOOR COIL

1.	Pump system down to 2 psig and recover refrigerant.
2.	Remove coil access panel and fitting panel from front of
	cabinet.
3.	Remove TXV support clamp using a 5/16-in. nut driver.
	Save the clamp.
4.	Remove R-22 TXV using a backup wrench on flare
	connections to prevent damage to tubing.
5.	Using wire cutters, cut equalizer tube off flush with vapor
	tube inside cabinet.
6.	Remove bulb from vapor tube inside cabinet.
7.	Braze equalizer stub-tube closed. Use protective barrier as

10 O'CLOCK

2 O'CLOCK

STRAP

SUCTION TUBE

8 O'CLOCK

7⁄8 IN. OD & SMALLER

SENSING BULB

4 O'CLOCK

LARGER THAN 7⁄8 IN. OD

necessary to prevent damage to drain pan.

IMPORTANT: Route the equalizer tube of Puron® TXV through suction line connection opening in fitting panel prior to replacing fitting panel around tubing.

8.Install TXV with 3/8-in. copper tubing through small hole in service panel. Use wrench and backup wrench, to avoid damage to tubing or valve, to attach TXV to distributor.

9.Reinstall TXV support clamp (removed in item 3).

10.Attach TXV bulb to vapor tube inside cabinet, in same location as original was when removed, using supplied bulb clamps (nylon or copper). See Fig. 5 for correct positioning of sensing bulb.

11.Route equalizer tube through suction connection opening (large hole) in fitting panel and install fitting panel in place.

12.Sweat inlet of TXV, marked “IN” to liquid line. Avoid excessive heat which could damage valve.

13.Install vapor elbow with equalizer adapter to vapor line of line set and vapor connection to indoor coil. Adapter has a 1/4-in. male connector for attaching equalizer tube.

—3—

A81032

Fig. 5—Position of Sensing Bulb

14.Connect equalizer tube of TXV to 1/4-in. equalizer fitting on vapor line adapter. Use backup wrench to prevent damage to equalizer fitting.

15.Proceed with remainder of unit installation.

CAUTION: Remove indoor coil piston if unit is to be installed on system with a TXV metering device.

550A, 552A, 556A specifications

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